Eliminate STOP_SIGNAL, use SIGTSTP directly

The STOP_SIGNAL macro was originally added for Convex Unix
(https://en.wikipedia.org/wiki/Convex_Computer).

In:

  git show 7a67dd45ca1c:gdb/m-convex.h

we see:

~~~
  /* Use SIGCONT rather than SIGTSTP because convex Unix occasionally
     turkeys SIGTSTP.  I think.  */

  #define STOP_SIGNAL SIGCONT
~~~

That's gdb-3.5, 1990...  In gdb/ChangeLog-3.x we see:

~~~
Tue Apr 18 13:43:37 1989  Randall Smith  (randy at apple-gunkies.ai.mit.edu)

        Various changes involved in 1) getting gdb to work on the convex,
	[...]
        Made whatever signal indicates a stop configurable (via macro
        STOP_SIGNAL).
        (main): Setup use of above as a signal handler.  Added check for
        "-nw" in args already processed.
        (command_line_input): SIGTSTP ==>STOP_SIGNAL.
~~~

Support for Convex Unix is long gone, and nothing else overrides
STOP_SIGNAL.  So just use SIGTSTP directly, removing a little
obfuscation.

(I don't really understand why we override [1] readline's SIGTSTP
handler (only) when reading scripts (and then fail to restore it
properly, assuming SIG_DFL...), but I'll leave that for another pass.

[1] - Actually, starting with readline 6.3, readline is no longer
installing its handlers while GDB is in control...)

gdb/ChangeLog:
2017-11-06  Pedro Alves  <palves@redhat.com>

	* event-top.c: Check SIGTSTP instead of STOP_SIGNAL thoughout.
	(async_init_signals): Adjust.
	(handle_stop_sig): Rename to ...
	(handle_sigtstp): ... this.
	(async_stop_sig): Rename to ...
	(async_sigtstp_handler): ... this, and delete STOP_SIGNAL !=
	SIGTSTP path.
	* event-top.h: Move signal.h include to the top.  Check SIGTSTP
	instead of STOP_SIGNAL thoughout.
	(handle_stop_sig): Rename to ...
	(handle_sigtstp): ... this.
	* top.c (command_line_input): Replace STOP_SIGNAL -> SIGTSTP.

1 files changed, 4 insertions, 4 deletions

diff --git a/gdb/top.c b/gdb/top.c
index 9f5dd58..f006c66 100644
--- a/gdb/top.c
+++ b/gdb/top.c
@@ -1184,9 +1184,9 @@ command_line_input (const char *prompt_arg, int repeat,
   /* Starting a new command line.  */
   cmd_line_buffer.used_size = 0;
 
-#ifdef STOP_SIGNAL
+#ifdef SIGTSTP
   if (job_control)
-    signal (STOP_SIGNAL, handle_stop_sig);
+    signal (SIGTSTP, handle_sigtstp);
 #endif
 
   while (1)
@@ -1244,9 +1244,9 @@ command_line_input (const char *prompt_arg, int repeat,
       prompt = NULL;
     }
 
-#ifdef STOP_SIGNAL
+#ifdef SIGTSTP
   if (job_control)
-    signal (STOP_SIGNAL, SIG_DFL);
+    signal (SIGTSTP, SIG_DFL);
 #endif
 
   return cmd;